Hi, I'm planning on buying the retina iMac 5K, with 3TB fusion and 32GB memory (DIY via 3rd party memory). I see that most people either buy the basic version or upgrade the GPU and CPU together (maxed out). Nobody seems to upgrade only the GPU (or only the CPU). I'm thinking of only upgrading the GPU to the M925x but leave the i5 CPU. Will that provide enough extra power to the 5K screen and future-proof my new iMac enough or is it really necessary to have the i7 together with the GPU upgrade to have any benefit from it? Does anyone have experience with a 5K iMac with the combination i5/M295X GPU? I'll use my iMac for normal office use but with lots of multitasking (10+ tabs in chrome, aperture, multiple spreadsheets, itunes,... all open at once). And further to organize my high-res DSLR photo's: evaluating/selecting/moving them. Not really doing heavy processing on the photo's. Thanks for any insights!